Keep the ui/keyboard ownes updated

Change-Id: Ie4008527ec268b1c67704bdc1e7ede4b60caf17e
Reviewed-on: https://chromium-review.googlesource.com/c/1321709Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606363}

ui/keyboard/OWNERS

-blakeo@chromium.org
+googleo@chromium.org
 shend@chromium.org
 shuchen@chromium.org
 wuyingbing@chromium.org